Pressure cooker



April 7, 1931.

J. H. JACOBS PRESSURE COOKFR' Filed Dec. 25. 3929 ,filly/lid,

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Patented pr. 7, T1931 .arl-:s

^ UNITE JSEFH H. ."IGBS, 0F ROCHESTER, NEW YORK PRESSURE CooxERApplication nled December 23, 1929. Serial No.. 416,072.

rllhis invention relates to improvements in pressure cookers of the typeemployed for cooking meats and vegetables in restaurants, hotels andother` places. is rlliis invention relates to an improvement of theconstruction shown and described in United States Letters Patent No.1,439,000, granted to me on December 19, 1922, and has vreference moreparticularly to the means :lo employed for securing the cover to thecontainer or the pot in suoli a manner that it will resist the steampressure.

The specific embodiment of the pressure cooker which forms the subjectof this invention relates more particularly to a pressure cooker oflarge capacity, as distinguished from a pressure cooker of a sizesuitable for domestic use like the one shown and described in the patentabove identified. lin restaurants and hotels where a large number ofpeople are fed, food is prepared in large quantities and the pressurecoolrer that forms the subject of this invention is usually constructedof such capacity that mi it will hold approximately fifty gallons, butit can, of course, be made smaller or larger as may be desired.

rlf'his invention can be most clearly d escribed and most readilyunderstood when te reference is had to the accompanying drawing in whichthe preferred construction has been illustrated, and in which:

'Figa 1 is a top plan view of the pressure coolrer; i

Fig. 2 is a side elevation thereof; Fig. 3 is a section taken on line3%, Fig. 1; and

Fie. 4

ln the drawing reference numeral 1 represents the container or the pot.This is preferably made from cast metal, such as aluminum and isprovided with a steam jacket 2, which is formed by means of a core whenthe pot is cast. A. Harige 3 extends outwardly about the open end of thecontainer and located directly beneath this flange is a steel band 4.This band is clamped against 'the outer surface of the pot by means of abolt 5 that extends through the radially projectis a section taken online 4 4,

21 is secured.

ing flanges 6 of the angle brackets 7, in the Imanner shown in Fig. 2.Three legs 8 are secured to the steel band at points 120 degrees apartand serve as supports or legs. fhe supports 8 are connected by means ofa circular band 9 and the pot l is therefore held above the floor by thesupport comprising members 4, 8 and 9. A cover 10 is supported on thetop of the pot and is adapted to form a steam tight closure therefor.The cover 10 is provided with a flange 11 that is adapted to extend overthe upper surface of flange 3 in the manner shown in Fig. 4. The coveris also provided with an annular rib 12 on its lower surface and thisserves to position the cover on the pot. The adjacent surfaces oflianges 3 and 11 are provided with substantially, semi-circular grooveswhich are adapted to receive the gasket 18. A tubular member 14 extendsupwardly from the central portion of the cover in the manner shown mostclearly in Figs. 2 and 8. The inner surface of member 14 is threaded forthe reception of the threaded tubular plug 15. Located within thetubular plug 15 is another plug which has been designated by referencenumeral 16. The lower end of plug 16 has a cylindrical downwardlyextending flange 17 and the plug portion is provided with an 4annulargrove 18. A pin 19 extends through the tubular plug and engages thegroove 18 in the manner shown in F ig. 3 and this pin serves to holdplug 16 against longitudinal movement while permitting it to rotate withrespect to the tubular plug 15. Plug 16 is provided with an axialopening for the reception of the cylindrical member 20 to the lower endof which a convex disk or washer A washer 22 surrounds the upper end ofmember 20 and rests on the 11pper end of plug 16. A spring 23 has itslonger end resting on the washer 22 and its upper end abutting the pin24.' YSpring 23 is under compression and tends to move the washer 21upwardly. The upper end of tubular plug 15 has a diametrical openingthrough which the .handle 25 extends. A loelr nut 26 has a threadedengagement with plug 15 and can be held in adjusted position by means ofa set screw 27. The tubular member 14 is provided with a number ofradial slots 28, through which the extensions 29 of the levers projectinthe manner shown in Fig. 3.

The cover is provided with a plurality of pairs of spaced lugs 30,between which the levers 31 are located and to which they are pivotallyattached by means of pins 32. The outer ends of levers 3l extend a shortdistance beyond the periphery of the cover and are each provided with anotch 33. Secured to the inner end of each lever is a sleeve 34. Thissleeve is held in place on the lever by means of rivets 35. The outerends of the extensions 29 project into the sleeves 34 and are free tomove longitudinally so as to telescope with respect to the sleeve. Theinner ends of extensions 29 are`y provided with a curved recess 36 ontheir upper ends or the reception of the ange 17. The convex washer 21engages the under surfaces of the extensions 29 and hold them againstthe lower ed e of `iange 17, so that when the tubular plug 15 isrotated, extensions 29 will be raised and lowered and since they areconnected with the inner ends of levers 31, these willbe tilted aboutpivots 32.

The band 4 is provided with outwardly extendin lugs 37, one n beingprovided for each o? the levers 31. line 38 is associated with each lugstructed in specifically dierent ways but have been shown as madeiromiiat steel bars each link having two openings, onek of which has beenindicated by reference numeral 39 and the other by reference numeral 40.The openings 39 are adapted to receive the lugs 37, while openings 40are adapted to receive the outer ends of levers 30, 1n the manner shownin Fig. 4. In order to prevent the links from falling oii from the lugsand becoming lost, a retainer 41 has been provided for each lug. Theseretainers consist of a metal band havingone end secured -tothe outer endof the lug with which it is associated by means of a screw 42. Theseretainers are curved in the manner shown in Fig. 4 and the lower archedportion which has been designated by reference numeral 42 acts as a stopfor the link 38 when it is in the dotted line position shown in Fig. 4.When the cover is to -be secured to the container or the pot, thetubular plug 15 is rotated so as to move it upwardly as far as it willgo, this moves the outer ends of the levers downwardly. The links 38 arenow put into place so that the outer ends of levers 31 project throughthe openings 40 and iftubular member 15 is now rotated so as to movedownwardly, the levers will have their inner ends moved downwardly,which in turn will move the outer ends upwardly, thereby putting thelinks 38 under tension and forcing the cover against the top of thepotso as to form a steam tight seal between the two. Since the 37. Theselinks may be con-A flange 17 moves in a straight line, whereas thelevers rotate about pivots 32, it' is obvious that the distance betweenthe pivots and the flange 17 varies and this is taken care of by thesliding movement between the extensions 29 and the sleeves 34. i

Since the cover is quite heavy and in order to facilitate the openingand closing of this cover, I have provided a hinge dev'ice whichconsists of a hinge member 43 that is secured to the band 4 by rivets orother suitable means.4 The upper end o member 43 has two spaced lugs 44between which the outer end of the second hinge member 45 is located. Apin 46 extends through openings in the lugs 44 and through an opening inmember 45 and is connected to the latter by means of a pin 47 whichholds it against movement with respect to member 45. of the hinge pin 46and has its outer end provided with a handle 49. This pipe is heldagainst rotation with respect to pin 4G by means of a transverse 'pin50. The cover is provided with a lug 51 which is located to one side onthe tubular member 14. Two bars 52 have one end secured to hinge member45 by means of a bolt 53 and pins 54, and have their other endsconnected with pins 51 by means of a bolt 55. Members 45 and 59. form alinklthat connects the cover with hinge member 43 and permits the coverto be movedfrom the full line position shown in Fig. 2, to the dottedline position.

stop 56 extends downwardly from the link and this engages the uppersurface of the cover to limit its rotation when it is moved to openposition.

In order to limit the outward movement oi the cover, the link comprisingmembers and 52 is provided with a pin 57 that extends upwardly. Aresilient stop member 53 is secured to the hinge member 43 by means ofscrews or rivets and this extends upwardly to such a distance that whenthe cover is moved to dotted line position pin 57 will engage the upperend of member 58 and limit the outward movement. A screw 59 determinesthe extent to which member 58 can iiex and serves as a means foradjusting the extent of the movement.

From the above description it will be apparent that I have produced apressure cools er provided with a cover which by means of a lockingmechanism that is positive in its action and which can be readilyadjusted so as to secure a tight joint between the cover and thecontainer.

Particular attention is called to the sliding connection between theextensions 29 and the levers as by this simple expedient, .theconstruction is greatly simplified and reliable results are secured.

A curved pipe 48 is secured to one end is hingedlj, attached thereto andwhich is held in place Having described the invention what I cover nearthe center thereof, a tubular plug claim as new is: threadedly connectedwith the tubular meinl. In a device of the class described, in ber, thetubular member having radial slots, combination, a container having oneend means 'for rotating the tubular plugna pluv 5 open, a hinge membersecured to the conrality of levers pivotally connected with the' 70tainer and projecting above the open end outer edge of the cover, saidlevers extending thereof7 a cover adapted to close the open to bothsides of the pivots, the inner en ds of end of he container,alugextendin upwardthe levers having extensions telescopically ly from thecover to one side Vof 51e center, connected therewith, the inner ends ofthe ex- 10 a link pivotally connected at one end withtensions'proj'ectin through the slots and 75 the lug and at the otherend with the hinge into the interior o the tubular member, and member,and a stop extending downwardly means engaging underneath the innerendsof from the link and adapted to engage the the extensions for holdingthem against the cover. lower end of the tubular plug. 2. In a device ofthe class described, in In testimony WhereofI aiiix in si ature. 50combination, a container having one end l JOSEPH H. A OBS.

open, a hinge member secured to the container and projecting above theopen end thereof, a cover adapted to close the open end of thecontainer, a lug extending upwardly 85 from the cover to one side of thecenter, a link pivotally connected at one. end with the lug and at theother end with the hinge member, a stop extending downwardly from g5 thelink and adapted to engage the cover, a 9

pin extending upwardly from the link, and a sto projecting upwardlybeyond the hinge inem er and adapted to engage the pin carried by thelink for limiting the outward 80 movement thereof. v Y 95 3 In a deviceofthe class described, in t t combination, a container having one endopen, a hinge member secured to the container and projecting above theopen end 86 thereof, a lug extending upwardly from the 10 cover to oneside of the center, a link pivotally connected at one end with the lugand at the other end with the hinge member, a sto m adapted to engagethe cover, a pin extending 1 upwardl from the link, a stop projectin uward y beyond the hinge member an adapted to engage the pin carried bythe link for limiting the outward movement u thereof, and ahandleattached to the link no for rotatin the same.

4. In a evice of the class described, in combination, a container openat one end, a cover adapted .to be secured to theopen end of thecontainer, and means for securing the u cover to the container, saidlast named means comprising a-plurality of levers pivotall con# f nectedwith the cover near the outer e ge of the latter, means for makingconnection bei tween the outer ends of the levers and the m container, aclam ing device secured to the fp the cover and a telescopic connectionbetween the inner ends of the levers and lthe'clamping device. eo 5. Ina device of the class described, havl ing in combination, a containeropen at one end and a cover adapted to close the .open end thereof,means for securing the cover to the container, said means comprisin atubular member extending outwardly om the no

